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ALARM AND SIGNALS
ht: high temperature prealarm
This alarm can be configured using the PG=1 parameter.
This alarm is delayed by the startup of the regulator (or by
going out of the stand-by) for a time equal to the parameter
PA and of 1 minute from the overcoming of the threshold. If
programmed as automatic, the reset occurs 1 degree below
the P7/2 threshold.
LH-HH: low-high humidity alarm
These alarms are delayed on start-up (or on exiting stand-by
mode) for a period equal to parameter PA, and for 1 minute
from exceeding the set threshold. These are signal-only alarms,
with an hysteresis of 1% R.H.
tc: compressor thermal overload alarm
Immediate alarm, causes the instant switching off of the
compressor. This is managed only if parameter H5= 1 or 5 (one
compressor only or two compressors in tandem).
tF: fan thermal overload alarm
Immediate alarm, causes the instant switching off of all
devices without respecting the compressor delay times. This
is managed only if parameter H5= 1 or 5 (one compressor only
or two compressors in tandem).
t1 / t2: fan 1-2 thermal
This alarm can be configured using the HA=6 or 7 parameter.
Immediate alarm, it causes the instantaneous shutdown of the
connected output:
• t1= 1 (ID2) supply fan
• t2= 2 (ID2) supply fan
If both of them are ON the flow alarm is forced too turning OFF
all the outputs (see description FL).
Machine shut-down signals
These appear in the event of internal machine malfunctions
and cause its shut-down. The code is displayed in the ambient
temperature (or hour-minutes) field of the LCD display.
er: c Checksum error during code check in Flash: the control
can no longer be used.
er: e The content of the EEPROM (parameter memory) is
damaged. A reset can be attempted by reloading the default
values.
er: L Insufficient power: Power voltage < 13Veff when writing
the default values or during an attempt to automatically
recovery an EEPROM damaged sector.
Page - IOM / @DNOVA-µAC-0907-E
AL: generic external alarm
This alarm can be configured by setting parameters Pb and
PC. If configured as a serious alarm, it switches off all actuators
without respecting the delay times.
PA: shelter power failure alarm
External power failure alarm delayed by 2 seconds. This is
generated for models configured as shelters when input ID6 is
open; it causes the immediate switching off of the compressor
and the heating element, and allows the opening of the
damper. It is a priority alarm in respect of the inhibition due to
a dehumidification request.
cL: clock failure alarm
Alarm generated by the malfunctioning of the clock board.
Interrupts the time band function, and the regulator goes into
ON status if even the current band provides an off command.
This event does not block the alarm log, which continues to
store the signals, however with incorrect time values.
n1: compressor 1 maintenance warning
n2: compressor 2 maintenance warning
Signal-only alarm generated when the hour counter threshold
has been exceeded, displayed together with the symbol, see
parameters c9 (compressor 1) and cA (compressor 2).
nF: filter maintenance warning
nU: fan maintenance warning
n2: compressor 2 maintenance warning Signal-only alarm
generated when the hour counter threshold has been
exceeded, displayed together with the symbol, see parameters
FC (filters) and FA (fan).
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